Tracer and method of identifying tracer in product

摘要

A method of detecting a tracer compound dissolved in a liquid composition by means of surface- enhanced spectroscopy comprises the steps of: a.optionally, diluting said liquid composition or said separated liquid by mixing with a diluent liquid; b.bringing a sample of the separated liquid into contact with, a spectroscopy- enhancing surface comprising gold, silver or copper; c.obtaining a Raman spectrum from the sample; and d.calculating, from said spectrum, the concentration of the tracer in the sample relative to the concentration of a second component of the composition.